I've found the specific sites you have open matter too. Google products (inbox especially) and AWS in particular are awful if you leave them open for a while. I

I've found the specific sites you have open matter too. Google products (inbox especially) and AWS in particular are awful if you leave them open for a while. I stopped doing that as soon as I noticed. On linux I also saw a lot of benefit to making sure hardware acceleration was force enabled (it's disabled on the platform by default for some reason; I also had to start optirun-ing it on my laptop). Firefox has literally never been faster or behaved better since making those two changes.